Hi Haochen, thanks for fixing 'gcc/fortran/target-memory.cc'.
But could you also include the 'gcc/fortran/intrinsic.cc' change proposed in https://gcc.gnu.org/pipermail/gcc-patches/2023-March/613030.html (and acknowledged by Steve)? This will replace "Unclassifiable statement" by "Cannot simplify expression" which is a bit more helpful. (After doing so, at least the dg-error in your testcase needs to be updated; I assume that it won't affect other testcases, but that needs to be checked. – And you should update the comment in the testcase as well - and in text you will put in the commit log, if applicable.) Additionally, Kewen suggested:
Since this test case is powerpc only, I think it can be moved to gcc/testsuite/gcc.target/powerpc/ppc-fortran.
Which sounds reasonable. Otherwise it looks good to me. On 03.03.23 10:12, HAO CHEN GUI wrote:
Hi, The patch escalates the failure when Hollerith constant to real conversion fails in native_interpret_expr. It finally reports an "Unclassifiable statement" error. The patch of pr95450 added a verification for decoding/encoding checking in native_interpret_expr. native_interpret_expr may fail on real type conversion and returns a NULL tree then. But upper layer calls don't handle the failure so that an ICE is reported when the verification fails. IBM long double is an example. It doesn't have a unique memory presentation for some real values. So it may not pass the verification. The new test case shows the problem. Compared to last version, this version moves the mpfr_init after NULL tree test and fixes the format problem according to Tobias's advice. Thanks a lot.
(The format issue was actually spotted by Bernhard.) Thanks for working on this! Tobias PS: One can also discuss Steve's suggestion about deprecating Holleriths / guarding the support behind some flag. But I think that's unrelated to this bug fix patch and should be discussed/done separately.
ChangeLog 2023-03-01 Haochen Gui <[email protected]> gcc/ PR target/103628 * fortran/target-memory.cc (gfc_interpret_float): Return FAIL when native_interpret_expr gets a NULL tree. * fortran/arith.cc (gfc_hollerith2real): Return NULL when gfc_interpret_float fails. gcc/testsuite/ PR target/103628 * gfortran.dg/pr103628.f90: New. patch.diff diff --git a/gcc/fortran/arith.cc b/gcc/fortran/arith.cc index c0d12cfad9d..d3d38c7eb6a 100644 --- a/gcc/fortran/arith.cc +++ b/gcc/fortran/arith.cc @@ -2752,10 +2752,12 @@ gfc_hollerith2real (gfc_expr *src, int kind) result = gfc_get_constant_expr (BT_REAL, kind, &src->where); hollerith2representation (result, src); - gfc_interpret_float (kind, (unsigned char *) result->representation.string, - result->representation.length, result->value.real); - - return result; + if (gfc_interpret_float (kind, + (unsigned char *) result->representation.string, + result->representation.length, result->value.real)) + return result; + else + return NULL; } /* Convert character to real. The constant will be padded or truncated. */ diff --git a/gcc/fortran/target-memory.cc b/gcc/fortran/target-memory.cc index 7ce7d736629..0c47aa6b842 100644 --- a/gcc/fortran/target-memory.cc +++ b/gcc/fortran/target-memory.cc @@ -416,11 +416,14 @@ gfc_interpret_float (int kind, unsigned char *buffer, size_t buffer_size, mpfr_t real) { gfc_set_model_kind (kind); - mpfr_init (real); - gfc_conv_tree_to_mpfr (real, - native_interpret_expr (gfc_get_real_type (kind), - buffer, buffer_size)); + tree source = native_interpret_expr (gfc_get_real_type (kind), buffer, + buffer_size); + if (!source) + return 0; + + mpfr_init (real); + gfc_conv_tree_to_mpfr (real, source); return size_float (kind); } diff --git a/gcc/testsuite/gfortran.dg/pr103628.f90 b/gcc/testsuite/gfortran.dg/pr103628.f90 new file mode 100644 index 00000000000..e49aefc18fd --- /dev/null +++ b/gcc/testsuite/gfortran.dg/pr103628.f90 @@ -0,0 +1,14 @@ +! { dg-do compile { target powerpc*-*-* } } +! { dg-options "-O2 -mabi=ibmlongdouble" } + +! Test to ensure that it reports an "Unclassifiable statement" error +! instead of throwing an ICE when the memory represent of the HOLLERITH +! string is not unique with ibm long double encoding. + +program main + integer, parameter :: k = 16 + real(kind = k):: b = 4h1234 +end program main + +! { dg-warning "Conversion from HOLLERITH" "warning" { target powerpc*-*-* } 10 } +! { dg-error "Unclassifiable statement" "error" { target powerpc*-*-* } 10 }
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